El alojamiento web guarda la cabecera.

Because alojamiento is a masculine noun in Spanish, so it takes el in the singular.

• el alojamiento
• los alojamientos

Even though the English idea hosting does not feel masculine or feminine, every Spanish noun has grammatical gender, and alojamiento happens to be masculine.

In Spanish, the main noun usually comes first, and the word that describes or classifies it usually comes after.

So:

• alojamiento web = web hosting
• literally, something like hosting web

This is normal Spanish word order. English often puts the modifier first, but Spanish commonly puts it after the noun.

Because web is acting like a classifier or label here, almost like an adjective.

Spanish often forms this kind of expression by putting the second word directly after the noun:

• alojamiento web
• página web
• servidor web

You could sometimes see structures with de, but here alojamiento web is the standard, natural expression.

Guarda is the third-person singular present indicative form of the verb guardar.

So it matches the subject el alojamiento web:

• yo guardo = I keep / save
• tú guardas = you keep / save
• él / ella / ello guarda = he / she / it keeps / saves

In this sentence, el alojamiento web is singular, so guarda is the correct form.

It can mean all of those, depending on context.

Common meanings of guardar include:

• to keep
• to save
• to store
• to put away

In a technical or computing context, guardar often means to save or to store. So in this sentence, it suggests that the web hosting stores or keeps the header.

Because cabecera is a feminine noun, so it takes la.

• la cabecera
• las cabeceras

In general Spanish, cabecera can mean things like a headboard, heading, or front/top section. In technical contexts, it often means header.

Spanish uses definite articles more often than English does.

So where English might say simply header in some contexts, Spanish often prefers:

• la cabecera

In this sentence, la cabecera sounds like a specific, understood header, so the definite article is natural.

Yes. Cabecera is a very context-dependent word.

Depending on the situation, it can mean:

• header in computing
• heading
• headboard of a bed
• front section or top part
• even other specialized meanings in journalism, transport, or medicine

So learners should not assume it always means exactly one thing. The context tells you which meaning is intended.

Not exactly in the traditional grammar sense, but it is functioning like one.

Web is a borrowed word from English, and in Spanish it often works as an invariable modifier after a noun:

• página web
• sitio web
• alojamiento web

It does not usually change form for gender or number in this use:

• un alojamiento web
• dos alojamientos web

The neutral, standard order is:

El alojamiento web guarda la cabecera.

That is:

• subject: El alojamiento web
• verb: guarda
• object: la cabecera

Spanish can change word order for emphasis, but this basic order is the most natural if you are simply stating a fact. For example, La cabecera la guarda el alojamiento web would sound more marked or emphatic, not neutral.

Both can be heard.

In Spain, alojamiento web is a perfectly normal and clear Spanish term. But in tech contexts, many people also use the English borrowing hosting.

So you may encounter:

• alojamiento web
• hosting

For a learner, alojamiento web is very useful because it is standard, transparent Spanish.